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Full text of "IS 15322: Particle Filters Used in Respiratory Protective Equipment--Specification"

**************** 




Disclosure to Promote the Right To Information 

Whereas the Parliament of India has set out to provide a practical regime of right to 
information for citizens to secure access to information under the control of public authorities, 
in order to promote transparency and accountability in the working of every public authority, 
and whereas the attached publication of the Bureau of Indian Standards is of particular interest 
to the public, particularly disadvantaged communities and those engaged in the pursuit of 
education and knowledge, the attached public safety standard is made available to promote the 
timely dissemination of this information in an accurate manner to the public. 




Mazdoor Kisan Shakti Sangathan 
"The Right to Information, The Right to Live'' 



IS 15322 (2003) : Particle Filters Used in Respiratory 
Protective Equipment--Specif ication . ICS 13.340.30 




Jawaharlal Nehru 
'Step Out From the Old to the New" 



aj^&vi iJii^s:y>K^ isb^^ni^seg 



:<>5&i| mT'5K^5?::5:^>^i»l 



K^^^iXSVCd^ 



Satyanarayan Gangaram Pitroda 
Invent a New India Using Knowledge 



Bhartrhari — Nitisatakam 
''Knowledge is such a treasure which cannot be stolen" 




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IS 15322: 2003 

w^ ft^e^ ir Mgw ^cRPf ^afr ^q^<R - RiRife 

Indian Standard 

PARTICLE FILTERS USED IN RESPIRATORY 
PROTECTIVE EQUIPMENT — SPECIFICATION 



ICS 13.340.30 



© BIS 2003 

BUREAU OF INDIAN STANDARDS 

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG 
NEW DELHI 110002 

June 2003 Price Group 8 



Industrial Safety and Chemical Hazards Sectional Committee, CHD 8 



FOREWORD 

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by the Industrial 
Safety and Chemical Hazards Sectional Committee had been approved by the Chemical Division Council. 

Work environment get contaminated due to gases, vapours, fumes, dust, mists and smokes. Where control 
measures, such as, total enclosure, ventilation, remote control already provided on a process or operation, 
do not prevent contamination of work environment, or where danger to health is significant, use of respiratory 
protective equipment is recommended. While gases and vapours are removed by chemical reaction, absorption 
or absorption, particulate matter is usually removed by simple mechanical filtration. Therefore, it is desirable 
that filter-type respirators are tested under simulted laboratory conditions and any defects removed so that 
the respirator affords desired protection at the time of actual use. This standard is intended to achieve these 
objectives. 

During this revision the Committee felt the need to update the standard keeping in view the international 
practices being followed world-wide. In order to ensure compatability of Indian particle filters with their 
international counterpart, this standard has been modified. Considerable assistance has been derived from 
EN 143 ; 1990 'Specification for particle filters used in respiratory protective equipment', in this revision and 
is generally in line with the same. 

The composition of the Committee responsible for formulation of this standard is given at Annex B. 

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, 
observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with 
IS 2 : 1960 'Rules for rounding off numerical \^\uqs{ revised )\ The number of significant places retained in 
the rounded off value should be the same as that of the specified value in this standard. 



IS 15322 : 2003 



Indian Standard 

PARTICLE FILTERS USED IN RESPIRATORY 
PROTECTIVE EQUIPMENT — SPECIFICATION 



1 SCOPE 

This standard prescribes requirements and method 
of test for particle filters and components in unassisted 
respiratory protective devices, except escape apparatus 
and filtering facepieces. 

2 REFERENCES 

The standards listed below contain provisions, which 
through reference in this text constitute provisions 
of this standard. At the time of publication, the editions 
indicated were valid. All standards are subject to 
revisions and parties to agreements based on this 
standard are encouraged to investigate the possibility 
of applying the most recent editions of the standards 
indicated below. 

IS No. Title 

8347:1977 Glossary of terms relating to 

respiratory protective devices 

14138 Respiratory protective devices; 

(Parti): 1994 threads for facepieces: Part 1 

Standard thread connection — 

Specification 

3 TERMINOLOGY 

For the purpose of this standard the definitions given 
in IS 8347 shall apply. 

4 CLASSIFICATION 

Particle filters shall be of following three classes: 

a) Filter class PI, 

b) Filter class P2, and 

c) Filter class P3. 

NOTE — PI filters are intended for use against solid 
particles only. P2 and P3 filters are sub-divided according 
to their ability to remove both solid and liquid particles 
or solid particles only. The protection provided by a 
P2 filter or P3 filter includes that provided by the 
corresponding filter of lower class or classes. 

5 REQUIREMENTS 

5.1 General 

The connection between filter(s) and facepiece shall 
be robust and leaktight. The connection between filter 
and facepiece may be achieved by a permanent or 
special type of connection or by a screw thread 
connection ( including threads other than standard 



threads ). If a standard thread is used it shall be in 
accordance with IS 14138 (Part 1 ). If the filter is a 
twin filter designated to be used with a twin filter 
facepiece, it shall not be possible to connect it to 
the standard thread connector. The filter shall be 
designed or marked to prevent incorrect assembly. 
The maximum weight of filter(s) designated to be used 
directly connected to a half mask shall be 300 g. The 
maximum weight of filter(s) designated to be used 
directly connected to a full face mask shall be 500 g. 

5.2 Materials 

The filter shall be made of suitable material to 
withstand normal usage and exposures to those 
temperatures, humidity and corrosive environments 
that are likely to be encountered. Internally it shall 
withstand corrosion by the filtering media. Material 
from the filter media released by the air flow through 
the filter shall not constitute a hazard or nuisance for 
the wearer. 

5.3 Mechanical Strength 

Before testing for breathing resistance, filtration 
efficiency and clogging, the filter shall be subjected 
to a test in accordance with A-2 simulating rough usage 
of the filter. 

After this treatment, the filters shall show no 
mechanical defects and shall meet the requirements 
for breathing resistance, filtration efficiency and 
clogging. 

5.4 Breathing Resistance 

The resistance imposed by filters to the flow of air 
shall be as low as possible and in no case exceed the 
values shown in Table 1 when tested in accordance 
withA-3. 

Table 1 Maximum Breathing Resistance 

{Clause 5 A) 



SI 




Filter Class 


Maxi 


mum 


Resistance 


No. 








in m 


ibaH) 




At 30 l/min 


At 95 l/min 


(1) 




(2) 


(3) 




(4) 






PI 


0.6 




2.1 


ii) 




P2 


0.7 




2.4 


iii) 




P3 


1.2 




4.2 


'> 1 


bar 


- 105N/m2 = 


100 kPa. 







1 



IS 15322 : 2003 



5.5 Filtration Efficiency 

The requirements shall be met before the temperature 
treatment described in A-4. If the filter does not meet 
the requirements after the temperature treatment, the 
filter shall be marked with an expiry date of shelf life. 
Filters not passing the paraffm oil test shall be marked 
in accordance with 7.1.4. 

The initial penetration of the test aerosols shall in 
no case exceed the values shown in Table 2 when tested 
in accordance with A-4.1 and A-4.2. 





Table 2 


Maximum Initial Penetration 






(Clause 5.5) 




S! 


Filter Class Maximum Initial Penetration 


No. 




of Test Aerosols (percent) 




Sodium Chloride 


Paraffin Oil 






Test, 95 1/min 


Test, 95 1/min 


(I) 


(2) 


(3) 


(4) 


i) 


PI 


20 


— 


ii) 


P2 


6 


2 


iii) 


P3 


0.05 


O.Ol 


5.6 


Clogging 







The initial penetration requirements of 5.5 shall be 
satisfied before and after the clogging test by each 
filter. 

NOTE — The clogging test with dolomite dust is for 
filters used in industry, and the clogging test with coal 
dust is for filters used in the coal mines. 

5.6.1 Clogging Test with Coal Dust for PI and P2 
Filters 

The inhalation resistance of the filter shall not be 
greater than 4 mbar for filter Class PI and 5 mbar for 
filter Class P2 when tested in accordance with A-5.1 
and loaded with 1.5 g of dust. 

5.6.2 Clogging Test with Dolomite Dust for PI and 
P2 Filters 

The inhalation resistance of the filter shall not be 
greater than 4 mbar for filter Class PI and 5 mbar for 
filter Class P2 when tested in accordance with A-5.2 
and loaded with 1.5 g of dust. 

6 PACKING 

Each respirator shall be packed suitably to prevent 
damage in transit. Cartridges shall be packed to 
prevent damage to threads and sealing surfaces. 

7 MARKING 

7,1 All encapsulations of encapsulated filters and 
all packages containing unencapsulated filters shall 



be marked at least with the following: 

a) Type and class ( PI, P2 or P3), 

b) Colour code ( Silver or light metal is regarded 
a neutral colour ), and 

c) Batch No. or Serial No. 

7.1.1 Sub-assemblies and piece parts with considerable 
bearing on safety shall be marked so that they can 
be identified. 

7.1.2 The name, trade-mark or other means of 
identification of the manufacturer. 

7.1.3 All filters, including unencapsulated, which do 
not pass the paraffin oil test shall be clearly marked 
with the following: 

'For use against solid aerosols only' 

7.1.4 The date ( at least the year ) of expiry of shelf 
life, when the filter does not meet the requirements 
after the temperature treatment. 

7.1.5 The sentence 'See instructions for use'. 

7.2 The marking shall be as clearly visible and as 
durable as possible. 

7.3 BIS Certification Marking 

7.3.1 The filtering half masks may also be marked 
with the Standard Mark. 

7.3.1.1 The use of the Standard Mark is governed 
by the provisions of the Bureau of Indian Standards 
Act, 1986 and Rules and Regulations made thereunder. 
The details of conditions under which the licence 
for use of the Standard Mark may be granted to 
manufacturers or producers may be obtained from the 
Bureau of Indian Standards. 

8 INSTRUCTIONS FOR USE 

8.1 Instructions shall accompany every smallest 
commercial available package. 

8.2 Instructions for use shall be in the languages 
acceptable to the user. 

8.3 The instructions for use shall contain all information 
necessary for trained and qualified persons on: 

a) Application/limitations, 

b) Type-identifying marking to ensure that the 
filter can be identified, 

c) Use, for example, is the filter intended to be 
used in industry or in the coal mining industry, 

d) Suitability of the filters marked for solid 
aerosols only, against water based aerosols 
defined as : water based aerosols are those 
produced from solutions and/or suspensions 



IS 15322 : 2003 



of particulate materials in water such that the 
only workplace contaminant is attributed to 
this solid material, 

e) Controls prior to use, 

f) Fitting, 

g) How the filter shall be inserted in the 
equipment for which it is designed, and that 
equipment to be named, 



h) Operation manual, 
j) Maintenance, and 
k) Storage. 

SA The instruction shall be unambiguous. If helpful, 
illustrations, part numbers, marking etc, may be added. 

8.5 Warning shall be given against problems likely 
to be encountered. 



ANNEXA 
( Clauses 5.3, 5.4, 5.5, 5.6.1 and 5.6.2 ) 

METHOD OF TEST FOR PARTICLE FILTERS USED IN RESPIRATORY PROTECTIVE 

EQUIPMENT 



A-1 GENERAL 

Each of the test specimens shall comply with the 
appropriate requirement. All performance tests except 
coal dust clogging shall be conducted so that the 
test air or test aerosol will pass through the filter 
horizontally. Each test shall be conducted with filters 
conditioned by the test described in A-2. When a 
single filter of a twin filter is tested separately the air 
flow specified for a test may be halved. If, however, 
it is possible that the single filter may be used alone, 
then the full air flow shall be used for testing. 

A-2 MECHANICAL STRENGTH 

A-2. 1 Apparatus 

The apparatus as shown schematically in Fig. 1, 
Consists of a steel case (K) which is fixed on a 
vertically moving piston (5), capable of being 
lifted up 20 mm by a rotating cam (N) and dropping 
down onto a steel plate (P) due to its own mass as 
the cam rotates. The mass of the steel case shall be 
more than 10 kg. 

A-2. 2 Procedure 

A-2.2.1 The filters shall be treated as received, removed 
from their packaging but still sealed. The filter 
shall be placed on their sides in the case (K) so that 
they do not touch each other during the test, 
allowing 6 mm horizontal movement and free vertical 
movement. 

A-2.2.2 After the test any loose material that may 
have been released from the filter shall be removed 
prior to the performance testing. The test rig 
shall be operated at the rate of approximately 



100 rotations/min for approximately 20 min and a total 
of 2 000 rotations. 

A-3 BREATHING RESISTANCE 

The filter shall be connected in a leaktight manner 
by means of a suitable adapter to the test 
equipment. Testing shall be carried out at two flow 
rates ( 30 and 95 1/min continuous flow ) with air at 
room temperature, ambient atmospheric pressure 
and of such humidity that condensation does not 
occur. The resistance values shall be corrected for 
the reactive value introduced by the adapter and 
to 23°C and 1 bar absolute. Each test shall be made 
with 3 specimens. 

A-4 FILTRATION EFFICIENCY 

A-4.1 The filters shall be tested before and after the 
following temperature treatment. The filters shall be 
exposed: 

a) for 24 h to dry atmosphere of 70 ± 3°C, and 

b) for 24 h to temperature of- 30 ± 3°C. 

The methods used for testing filters against solid and 
liquid aerosols are: 

a) sodium chloride test according to A-4.2, and 

b) paraffin oil test according to A-4.3- 

Sodium chloride test according to A-4.2 is the only 
method used for testing filters against solid aerosols. 

Each test shall be made with 3 specimens. 

A-4.2 Sodium Chloride Test 

An aerosol of sodium chloride particles is generated 
by atomizing an aqueous solution of the salt 



IS 15322 : 2003 



and evaporating the water. The concentration of 
this aerosol is measured before and after the filter 
under the test by means of flame photometry. 
Accurate determinations are possible in the range 
< 0-000 01 percent to 100 percent filter penetration. 

A-4.2.1 Apparatus 

A-4.2.1.1 The apparatus is shown in Fig. 2. The aerosol 
is generated using a collison atomizer filled with 
a 1 percent solution of sodium chloride. The atomizer, 
which is shown in Fig, 3, consists of a glass reservoir 
into which is sealed an atomizer head having three 
spray nozzles. Air is supplied to the atomizer at a 
pressure of 3.45 bar and the resulting liquid spray 
impinges on a baffle which removes the large particles. 
The particles which do not impact are removed in the 
air flow and, on mixing with dry air, the water evaporates 
leaving a dry sodium chloride aerosol. 

A-4.2.L2 The aerosol produced by this method is 
polydisperse with a mass median particle diameter of 
approximately 0.6 ^m. The particle size distribution 
is given in Fig. 4. It has been found that the aerosol 
remains constant, within acceptable limits, with respect 
to particle size and concentration provided that 
the supply pressure is in the range of 3.31-3.59 
bar and the flow rate of air to the three nozzles is 
12.5-13.0 1/min. The output is mixed with 82 1/minof 
dry air giving a total flow of 95 1 /min. 

A-4.2.L3 The salt solution in the atomizer is consumed 
at a rate of approximately 15 ml/h. This loss is due in 
part to the atomization of the solution and in part to 
evaporation of water from the reservoir. The volume 
of the reservoir is such that the change in concentration 
and loss in volume of the solution during an 8 h period 
will not cause an appreciable change in the 
characteristics of the test aerosol. 

A-4.2.L4 The sodium chloride aerosol is analyzed 
before and after the filter under test by flame photometry. 
The photometer used for this analysis can be any 
suitable instrument having the required sensitivity, 
however, a photometer specially designed to meet these 
requirements is available. The instrument is hydrogen 
flame photometer. The hydrogen burner is housed 
in a vertical flame tube which opens at its lower end 
into the sample tube through which the aerosol to be 
analyzed flows. The flow of aerosol to the flame is 
controlled by convection and is held constant with a 
bleed valve. 

A-4.2J,5 A small quantity of filtered air is fed 
continuously into the sample tube downstream of the 
inlet to the flame tube. The function of this supply is 
to prevent room air, which may contain considerable 
quantities of sodium salts, from reaching the burner 



when there is no flow through the sample tube. 

A-4.2J.6 The hydrogen burner, which gives a flame 
symmetrical about the vertical axis, is surrounded by 
a heat proof glass tube. This tube has to be optically 
homogeneous to minimize the effect on the light 
transmitted by the flame. 

A-4.2.L7 Sodium chloride particles in air passing 
through the flame tube are vaporized giving the 
characteristic sodium emission at 589 nm. The intensity 
of this emission is proportional to the concentration 
of sodium in the air flow. 

A-4.2.1.8 The intensity of the light emitted by the 
flame is measured using a photomultiplier tube. To 
separate the sodium emission from background light 
of other wavelengths a narrow band interference filter 
with appropriate sideband filters is used. This filter 
should preferably have a half-peak band width of not 
more than 5 nm. 

A-4.2.L9 As the photomultiplier output is only 
proportional to the incident light over a relatively small 
range, high light intensities are attenuated by neutral 
density filters. These filters are accurately calibrated 
in conjunction with the interference filter in use and 
so the actual light intensity can be calculated from 
the output of the photomultiplier. The signal from 
the photomultiplier is amplified and displayed on a 
meter or chart recorder. 

A-4,2.1J0 Calibration ofthe flame photometer will 
depend on the detailed design ofthe instrument and 
the manufacturers instructions should be followed if 
reliable results are to be obtained. In general, however, 
the methods which may be used are : multiple dilution 
ofthe aerosol dilution ofthe atomizer solution or a 
combination of both. If aerosol or solutions dilution 
is used alone the lower calibration limit is approximately 
two orders of magnitude higher than the ultimate 
sensitivity ofthe instrument. 

A-4,2.1.11 Where a photomultiplier with attenuating 
filters is used for detection this is unimportant as the 
photomultiplier measures a constant range of light 
levels over the entire range for the instrument and 
the values ofthe attenuating filters are known and 
invariable. Hence the calibration curve is linear at 
low concentrations and can safely be extrapolated to 
the lower values. The upper limit of linearity ofthe 
calibration curve is approximately 0. 12 mglvn? due to 
re-absorption of light within the flame. Non-linear 
calibration is possible above this point up to 
approximately 1 5 mg/m^. Where other detectors are 
used this may not be the case and a combination 
technique would be required to reach the ultimate 
sensitivity. 



IS 15322 : 2003 




All dimensions in millimetres. 
Fig. 1 Test Equipment for Test of Mechanical Strength 




COMPRESSED 
AIR 



3- 



AIR FILTER 



TEST 

AEROSOL 

GENERATOR 



rgh 



test 

CHAMBER 



SPECIMEN 




exhaust 



^ 



Jf 



r 



EXHAUST ' 



AEROSOL 

MEASURING 

APPARATUS 



Fig. 2 Apparatus for Sodium Chloride Test 



IS 15322 : 2003 




1 


Glass screw top jar 


2 


Nozzle 


3 


Fibre washer 




4.5 mm external diameter 




2.0 mm internal diameter 




0.8 mm thickness 


4 


Sleeve 


5 


Stem 


6 


Rubber gasket 


7 


Head 


8 


Rubber gasket 




25,0 mm external diameter 




10.0 mm internal diameter 




1.5 mm thickness 




Seals to be airtight 


9 


Nut 


10 


Screw cap 



Fig. 3 Atomizer 





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-^ 


— \^>c\ TP.ciT APRnsni 


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U7P nisTRiRUTinN PRnnurpn ry 


























1 






























c 




























































ATOMIZING 1 Vo NaCI sol. at 3.45 bar J 
























1 

.a 

^1,0 
















































































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a. 





























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0,01 
0, 














































m o,( 


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0, 


2 


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5 t 


2 


3 


4 


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6 


7 


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5 9 


8 9 


9 9S 


'.8 


99, 



0.1 



50 

PERCENTAGE BELOW STATED SIZE % 
Fig. 4 Particle Size Distribution 
6 



99,9 



IS 15322:2003 



A-4.2.2 Test Conditions 

Particle size distribution of 
{seeYig. 4 ): 

a) Flow rate of test aerosol 

b) Aerosol concentration 

c) Air pressure to atomizer 

d) Flow rate to atomizer 

e) Flow rate of diluting air 

f) Flow rate of hydrogen to 
photometer 

g) Wavelength of sodium 
emission 

h) Air temperature 

j) Relative humidity 

A-4.2.3 Test Procedure 



the test aerosol 

95 1/min 
8 ± 4 mglxn^ 
3.45 ±0.14 bar 
12.75 ±0.25 1/min 
82 1/min 

450-500 m 1/min 

5 89 nm 
ambient 
< 60 percent 



The test aerosol is fed into the test chamber, where 
the filter under test is fixed. A flow of 95 1/min is blown 
through the filter and the aerosol if fed into the test 
chamber, where the filter under test is fixed. A flow 
of 95 1/min is blown through the filter and the aerosol 
concentration if measured immediately before and after 
the filter by the photometer. The initial penetration 
shall be measured at 3 ± 0.5 min. 

A-4.2.4 Calculation of the Penetration 



P = 



X 100 percent 



where 

P = penetration, 

C, == sodium chloride concentration before the 



filter, and 

sodiui 
filter. 



Cj = sodium chloride concentration after the 



A-4,3 Paraffin Oil Test 

An aerosol of paraffin oil droplets is generated by 
atomizing heated paraffin oil. The concentration of 
this aerosol is measured before and after the filter under 
test by means of an aerosolphotometer. Accurate 
determination are possible in the range < 0.000 3 percent 
to 100 percent filter penetration. 

A-4.3.1 Apparatus 

The apparatus is shown in Fig. 5. The aerosol is 
generated using an atomizer ( Fig. 6 and 7 ). The 
atomization vessel (6) is filled with paraffin oil 
( paraffinum perliquidum CP 27 DAB 7 ), so that the 
oil level is between the minimum/maximum-marks (10). 
The atomization vessel is heated by means of an electric 
heating device (8), so that the temperature of the oil 
is kept to lOO^C by means of a thermostat (9). The 
temperature is measured by the thermometer (11). 
Filtered compressed air at 4 bar ( 3, 4 ) is pre-heated 



in (8) and blown through the multiple nozzle unit (12) 
and Fig. 7. Large droplets in the generated oil mist 
are separated in the control nozzle (13) and in the spiral 
tube (15). In the mixing vessel (5) the oil droplets 
and oil vapour are diluted with 50 1/min filtered air, 
measured by the flowmeter (2). Since the diluting air 
is at room temperature, the oil vapour condenses in 
the mixing vessel. The generated aerosol is the test 
aerosol, which is reduced to the test concentration 
of 20 ± 5 mg/m-^ by wasting an appropriate fraction of 
the oil mist ( see Fig. 5, item 1 8 in connection with 1 1 , 
7, 10, 12 and 17) and by further dilution with filtered 
air at a flow rate of 83 1/min in the blowers actuated" 
by air power ( type Friedrichs-Antilinger, see Fig. 5, 
item 5 and Fig. 8 ). The test aerosol produced by 
this method is polydisperse. The particle size 
distribution is a logarithmic normal distribution with 
the median stokes diameter of 0.4 fim ( for the 
number distribution ) and the logarithmic standard 
deviation 0.26 ( see Fig. 9 ). 

The test aerosol is fed into the test chamber 
[ Fig. 5 (1) ], where the filter under test is to be 
fixed (15). The excess of the aerosol is filtered by a 
high efficiency filter with a low flow resistance (10). A 
flow rate of 95 1/min is drawn through the filter under 
test. The test concentration is measured before and 
after the filter under test by means of an integrating 
light scattering photometer. The principle of the 
aerosolphotometer is shown in Fig. 10. The 
instrument is a 45° scattering photometer. The light 
source is directed to the measuring cell and to the 
photomultiplier. The direct beam to the multiplier is 
inerrupted by a chopper, so that the scattered light fi*om 
the particles is always corrected for the source intensity 
variations. The reference beam is attenuated by means 
of neutral density filters and of a neutral density wedge 
automatically to the intensity of the scattered light beam. 
The intensity of the scattered light, which is a measure 
for the aerosol concentration, is displayed. 

A-4.3.2 Test Conditions 

a) Particle size distribution 



of the test aerosol 
b) Flow rate through the 



see Fig. 9 





filter under test 


; 95 1/min 


c) 


Aerosol concentration 


: 20 ± 5 mg/m"^ 


d) 


Air temperature 


: ambient 


e) 


Air pressure to atomizer 


:4±0.15bar 





Flow rate to atomizer 


: 13.5 ±0.5 1/min 


g) 


Mixing air flow rate in 






aerosol generator 


: 50 1/min 


h) 
J) 


Flow rate of diluting air 
Temperature of the oil 


: 83 1/min 




in the generator 


: between lOOX 
and 11 OX 



IS 15322 :2003 




COMPRESSED AIR 



COMPRESSED AIR 



1 Test chamber: Rigid transparent material, 

diameter 500 mm, height 500 mm, 
covered with plywood on both 
sides 

2 Tightly fitting door of the chamber 

3 Dish for collecting oil running down the walls of 
the tube 

4 Cover for the blowers actuated by air power 

5 Blowers actuated by air power for taking the 
concentrated oil mist into the chamber 

6 Flowmeters, range 800-8 000 l/h 

a) for measuring the propellent air for the blowers 
(5 000 l/h) 

b) for measuring the test flow rate (95 l/min) 

7 Valves controlling the flow rate 

8 High efficiency filters 

9 Reducing valves, range 1 -5 bar at a prepressure 
of 6-10 bar 



10 High efficiency filter with low resistance 

1 1 Tee for taking out the amount of oil mist necessary 
for testing 

1 2 Needle valve controlling the oil mist concentration 
in the chamber 

13 Oil mist generator 

14 Aerosolphotometer 

1 5 Connecting pipe to test object 

16 Probe for measuring the oil mist concentration 
in the chamber. The aerosolphotometer Is 
connected with 1 5 or 1 6 as required by means 
of a short tube. The connecting pipe not employed 
is to be closed tightly. The tubes for the oil mist 
are textile reinforced plastics tubes with an inner 
diameter of 19 mm 

17 Woulfe's bottle 

18 Buffer volume of 51 



Fig. 5 Apparatus for Paraffin Oil Test 



IS 15322:2003 




16tt4 



EXHAUST 



lE'^^Vf 



MEASURING 



1 


5 bar air inlet with airfilter 


2 


Flowmeter 


3 


Pressure reducer 


4 


Manometer 


5 


Mixing vessel 


6 


Atomization vessel 


7 


Thermostat vessel 


8 


Heating jacket 


9 


Thermostat 


10 


Oil-level indicator 


11 


Thermometer 



12 Atomization nozzle 

13 Control nozzle 

14 U-tube manometers 

15 Spiraltube 

16 Drainage screw 

17 Outlet to measuring device 

18 Waste outlet 

19 Change-over valve 

20 Oil pump 

21 Oil supply container 

22 Locking screw 



Fig. 6 Generator for Paraffin Oil Aerosol 



A-4.3.3 Test Procedure 



The test aerosol if fed into the test chamber, where 
the filter under test is fixed. A flow rate of 95 l/min 
is sucked through the filter by means of a suitable 
pump. The aerosol concentration is measured 
immediately before and after the filter by the 
aerosolphotometer. The initial penetration shall be 
measured at 3 ± 0.5 min. 

A-4.3.4 Calculation of the Penetration 



/,-/o 



X 100 percent 



where 

P = penetration, 

/^ = photometer reading before the filter, 

L = photometer reading after the filter, and 

/q ^ photometer zero reading for clean air. 

A-5 CLOGGING 

The test aerosol shall be dolomite or coal. A total of 
3 filter shall be tested: 1 as received and 2 after 
temperature conditioning in accordance with A-1 .1 . 



IS 15322 : 2003 



1.5 Dl A 



PARAFFIN OIL- 




1,9 DIA 




DETAIL X 



MULTIPLE NOZZLE UNIT ITEM 




All dimensions in millimetres. 
Fig. 7 Atomizer 



A-5.1 Clogging Test Using Coal 

A-5.1.1 Principle 

The test consists of drawing dry, dust laden air 
through the filter on the inhalation cycle of a sinusoidal 
breathing machine and blowing moist, dust free air 
through the filter during the exhalation cycle and 
determining the pressure drop across the filter 
following the collection of 1 .5 g of dust. The test shall 
be conducted with the inhaled air at an ambient 
temperature of 27 ± 2°C and at 65 ± 5 percent relative 
humidity and the exhaled air at 37 ± 2''C and 95 percent 
relative humidity. 

A-5.1. 2 Test Equipment 

A scheme of a typical apparatus is given in Fig. 11. 
The double acting breathing machine B ( 2 I/stroke, 
1 5 cycles/min ) and the critical orifice O in conjunction 
maintain the flow rate through mixing chamber C and 
nozzle A essentially constant at 95 1/min and 9.5 1/min 
respectively throughout the sinusoidal breathing cycle, 
so ensuring dust conditions within the chamber C. 

For measuring the pressure drop and setting up flow 
through nozzle A, valve X is set at calibrate; during 
these operations the breathing machine is switched 



off. For testing the valve is set at test. For determining 
the quantity of dust which shall be introduced into 
the hopper H in order that 1 .5 g be collected on the 
filtering half mask, valve Y is set at calibrate; at this 
setting the flow rate during exhalation is zero. 

A-5.1. 3 Test Condition. 

The dust used for the clogging test shall be coal dust 
ground by ball mill and graded by sieving, the portion 
which passes a 240 mesh ( 63 |nm aperture) sieve being 
used for the test. The size distribution of coal dust is 
given in Table 3. 

A-5.1. 4 Test Procedure 

A-5.1. 4.1 The test apparatus shall be setup connecting 
a weighed filter into the air circuit at the top of chamber 
C. Valve X shall be set to calibrate and air shall be 
drawn through the filtering half mask at 95 1/min; valve 
E shall be adjusted until the flow through the nozzle 
A is 9.5 1/min. Valve X shall then be set to test and 
valve Kto calibrate, a known weight of dust shall be 
fed into the hopper H and dispersed into the chamber. 
After dispersal, the filter shall be re-weighed. A number 
of filter shall be exposed until the weight of dust which 
shall be introduced into the hopper to give a 1.5 g 
collection is determined. 



10 



IS 15322:2003 



060 




yfe^v; 




A-A 




All dimensions in millimetres. 
Fig. 8 Blowers Actuated by Air Powers 



IS 15322 : 2003 



UJ 

o 

LU 

o 

< 
UJ 

S 

UJ 

o 



10 



PARAFFIN OIL MIST 
NUMBER DISTRIBUTION 

LOG d = 0.26 




2 3 k 5 678 10*^ 2 3 4 5 6 78 10** 2 3 4 5 6 txmlO^ 



STOKES DIAMETER IN p m 



Fig. 9 Particle Size Distribution of Paraffin Oil Mist 



BEAM REGULATOR 



DIRECT LIGHT BEAM 



REGULATING MOTOR 



PHOTO 
MULTIPLIER 




-LIGHT SOURCE 



T^MPLIFIER 



MEASURING CHAMBER 



Fig. 10 Scheme for the Aerosol Photometer 



IS 15322:2003 



A-5. 1.4.2 Connect the filter into the chamber. Valve 
K shall be set to test, the previously determined weight 
of dust shall be introduced into the hopper H and 
after allowing the filter to reach equilibrium the 
dust shall be dispersed into chamber C. After dispersal 
valve X shall be set to calibrate and the breathing 
machine turned off The pressure drop across the filter 
at 95 1/min shall be read off manometer M. 

A-5. 1.4.3 Repeat the test on the other two samples 
and report the 3 recorded pressure drops. After 
completion of the clogging test the filter shall be allowed 
to stabilize in the laboratory for 24 h at the end of 
which time the filtration efficiency of each filter shall 
be determined. 

A- 5.2 Clogging Test Using Doiomite Dust 

A-5.2.1 Principle 

The test consists of subjecting the filter to a 
sinusoidal breathing simulation. Whilst the sample 
is surrounded by a known concentration of dolomite 
dust in air. Following the exposure, the breathing 
resistance and the filter penetration of the sample filter 
are measured. 

A-5.2.2 Test Equipment 

A scheme of a typical apparatus is given in Fig. 12. 
The working area of the test chamber has a suggested 
square section of 650 mm x 650 mm. The breathing 
machine has a displacement of 2 1 /stroke. The exhaled 
air shall pass a humidifier in the exhaled air circuit, 
such that the exhale air temperature, measured at the 
position of the sample filtering half mask is 37 ± 2°C 
and 95 percent RH minimum. 

A-5.2.3 Test Conditions 

a) DUST : DRB 4/15 dolomite. The size 
distribution of dolomite dust is given 
in Table 4. 

b) The particle size distribution of the air borne 
dust at the working area of the dust chamber 
is given in Fig. 13. This characteristic is an 
essential parameter, which shall be verified 
especially if the geometry of the test chamber 
is somewhat different from the model 
described in this standard. 

c) Continuous flow through the dust chamber: 
60 mVh, linear velocity 4 cm/s. 

d) Sinusoidal flow through the filter is delivered 
by a breathing machine adjusted to 1 5 cycles/ 
min and 2.0 l/stroke; the exhaled air shall be 
saturated in humidity. 



e) Concentration of the dust : 400 ± 1 00 mg/m^ 

f) Temperature of the air :27±2°C 

g) Relative humidity of the 

air :45 ± 15 percent 

h) Testing time : Until the product of 
measured dust concentration and exposure 
time is 833 mg \\lm^ or until: 

1) For valved filter the peak inhalation 
resistance ( corresponding to a conti- 
nuous flow of 95 1/min ) has reached 
4 mbar for class PI or 5 mbar for class 
P2 or until the peak exhalation resistance 
has reached 1.8 mbar (corresponding 
to 3 mbar at a continuous flow of 
160 1/min); and 

2) For valveless filter the peak inhalation 
resistance or the peak exhalation 
resistance has reached 3 mbar for class 
P 1 or 4 mbar for class P2. 

NOTE — 833 mg h/m^ corresponds to inhaling a total 
volume of air laden with 1 .5 g of dust. This is represented, 
for example, by a dust concentration of 400 mg/m^ and 
an exposure time if 125 min. Because of the dust loses 
on exhalation the cumulative weight of dust collected 
on the filtering half mask will probably be less than 
1.5 g. For this reason there is no purpose in weighing 
the sample filtering half mask. 

A-5. 2. 4 Test Procedure 

Dust from the distributor shall be conveyed to the 
dust chamber where it shall be dispersed into the air 
stream of 60 mVh. 

The sample filter shall be fitted in a leak tight 
manner to a dummy head or a suitable filter holder 
located in the dust chamber. The breathing machine 
and humidifier shall be connected to the sample and 
shall be operated for the specified testing time. 

The concentration of dust in the test chamber may 
be measured by drawing air at 2 l/min through a 
sampling probe equipped with a pre-weighed, high 
efficiency filter ( open face, diameter 37 mm ) located 
near the test sample, as shown in Fig. 14. 

The dust concentration shall be calculated from the 
weight of dust collected, the flow rate through the 
filter and the time of collection. Other suitable means 
may be used. 

A-5.2.5 Assessment of Clogging 

Following the exposure the breathing resistance 
of the filter shall be measured using clean air. The 
filter penetration shall then be measured in 
accordance with A-4. 



13 



IS 15322 : 2003 

Table 3 Size Distribution of Coal Dust 

(Clause A- 5 A. 3) 



SI No. 


Coulter 


Counter 




Sedimentation Analysis 




'size ( Equivalent 


Number of Particles 


' Size ( Stokes 




Weight Oversize' 




Spherical Diameter ) 


Oversize, Percent 


Diameter ) 




Percent 




Mm 






urn 






(1) 


(2) 




(3) 


(4) 




(5) 


i) 


2.5 




100 


2.5 




89.0 


ii) 


3.0 




65 


3.0 




87.5 


iii) 


5.0 




27 


5.0 




80.5 


iv) 


7.0 




14.6 


7.0 




77.0 


V) 


10.0 




7.7 


10.0 




65.0 


vi) 


15.0 




3.5 


15.0 




52.5 


vii) 


20.0 




1.9 


20.0 




36,0 


viii) 


25.0 




1.1 


25.0 




31.2 


ix) 


30.0 




0.6 


30.0 




23.2 


X) 


35.0 




0.3 


35.0 




15.7 


xi) 


40.0 




0.2 


40.0 




9.3 



Table 4 Size Distribution of Dolomite Dust 

{Clause A-5 23) 



SI No. 




Coulter 


Counter 




Sedimen 


itation 


Analysis 




Size ( Equivalent 

Spherical Diameter ) 

pm 




Number of Particles 
Oversize, Percent 


Size( Stokes 
Diameter ) 




Weight Oversize, 
Percent 


(1) 




(2) 






(3) 


(4) 




(5) 


i) 




0.7 






100 


1 




99.5 


ii) 




1 






80 


2 




97.5 


iii) 




2 






30 


3 




95 


iv) 










17 


5 




85 


V) 




5 






7 


8 
10 




70 
50 


vi) 




9 






2 


12 
14 




26 
10 


vii) 




12 






1 


18 




1 



14 



IS 15322 : 2003 



AIR SUCTION 
CRITICAL ORIFICE i 



DOUBLE ACTING 
BREATHING 
MACHINE, B 



HUMIDIFIER 



HYGROMETER 



MANOMETER M 
HYGROMETER 




VALVE POSITION 
TEST 



-4^\^VALVEYa 
--b /"^VALVEYb 
CALIBRATE 



VALVE Xb 



^\^ VALVE Ya 

4- 



iy- 



VALVE Yb 



TEST 
VALVE Xb 



-VALVE Xa 



NOZZLE A 
TURNTABLE T 



CALIBRATE 



iy- 



VALVE Xb 



' VALVE Xa 



Fig. 1 1 Typical Sinusoidal Dust Clogging Test Apparatus for Valveless Filtering Half Masks 



15 



IS 15322 : 2003 



INJECTOR 



ESSED I 3 J_ 



COMPRESSED < 
MR AIR 

FILTER 



cz> 



DUST 
DISTRIBUTOR 



DUST TEST CHAMBER 
PROBE 



PROBE LINE 




FILTER 



PUMP 



(THgHQ 



EXHAUST 



FLOW 
METER 



PUMP 

COUNTER 



m 



EXHAUST 



HUMIDITY 



Fig. 12 Typical Sinusoidal Dolomite Dust Clogging Test Apparatus 



0.01 



SIZE DISTRIBUTION (MASS) 
DOLOMITE DRS 4/15 TEST AEROSOL 




2 3 4 5678 10 20 30 CO 60|im100 
PARTICLE -DIAMETER MASS BASIS \im ^ 



Fig. 1 3 Particle Size Distribution of Dolomite Dust in the Test Chamber 



16 



IS 15322 : 2003 



□650 



OPENNING IN 
DUST CHAMBER 




DUMMY 
HEAD 



AIR FLOW 



RECOMMENDED PROBE POSITION 



DUMMY HEAD ADAPTER 

50,, 15 



METHYL 
METHACRYLATE 




0U 



0U 



Weld grid 
V 



I^J 






M60-1 ^ 






I ■ - . 






1 ! i 


r- 


o 


i^ . , M „^ 






1^ 




l^d 






06? 







DUMMY HEAD CONFIGURATION 



DUMMY HEAD FILTER HOLDER 

FOR REMOVAL OF PARTICLES PENETRATING 

THROUGH THE FILTER 



All dimensions in millimetres. 
FiG. 14 Details of Typical Dolomite Dust Clogging Test Apparatus 

17 



IS 15322 : 2003 



ANNEX B 

( Foreword ) 

COMMITTEE COMPOSITION 



Industrial Safety and Chemical Hazards 

Organization 

National Safety Council, Mumbai 
Airports Authority of India, New Delhi 
Atomic Energy Regulatory Board, Mumbai 
Bhabha Atomic Research Centre, Mumbai 
Central Boiler Board, New Delhi 
Century Rayon, Thane 

Central Leather Research Institute. Chennai 

Central Mining Research histitute, Dhanbad 

Central Warehousing Corporation, New Delhi 

Confederation of Indian Industries, New Delhi 

Department of Explosives, Nagpur 

Department of Industrial Policy and Promotion, New Delhi 

Development Commissioner ( SSI ), New Delhi 

Directorate General of Health Services, New Delhi 

Directorate General, Factory Advice Services and Labour 
Institutes, Mumbai 

Directorate of Industrial Safety and Health (Factory 
Inspectorate ), Mumbai 

Directorate General of Mines Safety, Dhanbad 

Employees State Insurance Corporation, New Delhi 
Excel Industries Limited, Mumbai 
Hindustan Aeronautics Limited, Bangalore 
Hindustan Lever Limited, Mumbai 

Indian Institute of Chemical Technology, Hyderabad 
Indian Chemical Manufacturers Association, Mumbai 

Indian Drugs and Pharmaceuticals Limited, Rishikesh 
Indian Petrochemical Corporation Limited, Vadodara 

Indian Space Research Organization, Sriharikota 

Industrial Toxicology Research Centre, Lucknow 

Ministry of Defence ( DGQA ), New Delhi 

Ministry of Defence, Directorate of Standardization, 
New Delhi 

Ministry of Defence ( OFB ), Kolkata 



Sectional Committee, CHD 8 

Representative(s) 

Shri K, C. Gupta ( Chairman ) 

Representative 

Shri P. K. Ghosh 

Dr B. N. Rathi 

Representative 

Shri H. G. Uttamchandani 

Shri S. K. Mishra ( Alternate ) 

Representative 

Shri J. K. Pandey 

Representative 

Representative 

Representative 

Dr D. R. Chawla 

Representative 

Representative 

Dr a. K. Majumdar 

Shri S. R Rana ( Alternate ) 

Representative 

Director of Mines Safety ( MSE ) 

Deputy Director of Mits^s Safety ( HQ ) 
( Alternate ) 

RePRESENTATiVE 

Representative 

Representative 

Shri B.B.Dave 

Shri Aditya Jhavar ( Alternate ) 

Shri S. Venkateswara Rao 

Shri V.N. Das 

Shri A. A. Panjwani ( Alternate ) 

Representative 

Shri R Vuayraghavan 

Shri M. R. Patel ( Alternate I ) 
Shri A. V. Sarathy ( Alternate II ) 

Shri P. N. Sankaran 

Shri V. K. Srivastava ( Alternate ) 

Dr Virendra Misra 

Dr V. P. Sharma ( Alternate ) 

Shri M.S. Sultania 

Shri Sujit Ghosh ( Alternate ) 

Shri P. S. Ahuja 

Lt-Col Tejinder Singh ( Alternate ) 

DrD. S.S.Ganguly 

Shri R. Srinivasan ( Alternate ) 



18 



( Continued on page 1 9 ) 



{Continued from page 18 ) 



IS 15322 : 2003 



Organization 
Ministry of Defence (R&D ), Kanpur 

Ministry of Environment and Forest, Npw Delhi 
National Institute of Occupational Health, Ahmedabad 
National Organic Chemical Industries Limited, Thane 

National Safety Council, Mumbai 

Oil Industry Safety Directorate, New Delhi 

Safety Appliances Manufacturers Association, Mumbai 

Standing Fire Advisory Council, New Delhi 

Steel Authority of India Limited, Ranchi 

SIEL Chemical Complex, New Delhi 

Southern Petrochemical Industries Corporation Limited, 
Tuticorin 

Tata AIG Risk Management Services Limited, Mumbai 

BIS Directorate General 



Representative (s) 

Dr a. K. Saxena 

Dr RAJiNfDRA Singh ( Alternate ) 

Representative 

Representative 

Dr B. V Bapat 

Shri V. R. Narla ( Alternate ) 

Shr! R M. Rao 

Shri D. Biswas (Alternate ) 

Shri S. K. Chakrabarti 

Shri V. K. Srivastava ( Alternate ) 

Representative 

Representative 

Representative 

Representative 

Shri V. Jayaraman 

Shri S. Muruganandam ( Alternate ) 

Shri Urmish D. Shah 

Shri S. K. Chaudhuri, Director & Head ( CHD ) 
[ Representing Director General ( Ex-officio ) ] 



Member Secretary 

Shri N. K. Pal 

Director ( CHD ), BIS 



19